Conex DT-11 DTMF Tone Encoder

16-Button Keypad with User-Insertable Legends.
The keypad generates all 16 DTMF tones.
Internal DIP-Switch sets keypad for 2 octaves of musical scale notes.
All DTMF and 2 Octaves of Musical Notes (tones and semitones) controllable via RS-232
The electronically balanced audio output is adjustable to +10 dBu.
The DT-11 can be remote controlled (via RS-232) or external contact closure to ground.
Front panel LEDs indicate power, RS-232 signal and Tone output.
DB-25 Connector for Remote Switches - Includes pins for RS232, External Power, and Audio Output.
Dimensions: 4"W x 5"L x 1" H